基于混沌算法的光学图像加密方法

Optical Image Encryption Method Based on Chaos Algorithm

由于传统方法在实际应用中生成的密匙和密文体积比较大,导致存在无法对光学图像像素进行较好扩散和加密后图像像素相关系数较高等问题,因此提出了基于混沌算法的光学图像加密方法。利用一个与光学图像变换域不相关的压缩矩阵对图像进行压缩感知,通过隔空抽取置乱图像打乱光学图像的明文轮廓,再利用菲涅尔衍射技术生成图像密匙,利用混沌算法生成图像秘钥,实现基于混沌算法的光学图像加密。实验证明,设计方法对图像加密后图像像素相关系数小于传统方法,加密效果更佳。

Due to the large volume of the generated key and ciphertext in the practical application of the traditional method,the optical image pixels cannot be diffused well,and the correlation coefficient of the encrypted image pixels is high.Therefore,an optical image encryption method based on chaos algorithm is proposed.Using a compression matrix not related to the optical image transformation domain to perform compressed sensing on the image,scrambling the plaintext outline of the optical image by extracting and scrambling the image,using the Fresnel diffraction technology to generate the image key,and then using the chaos The algorithm generates the image secret key and realizes the optical image encryption based on the chaotic algorithm.Experiments show that the image pixel correlation coefficient of the designed method after image encryption is smaller than that of the traditional method,and the encryption effect is better.